[INFO] fetching crate contracts 0.6.6...
[INFO] checking contracts-0.6.6 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] extracting crate contracts 0.6.6 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate contracts 0.6.6
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate contracts 0.6.6
[INFO] tweaked toml for crates.io crate contracts 0.6.6 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate contracts 0.6.6 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate contracts 0.6.6 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8c6e4e67ce6b381e88b7ca2de6d6557d907b9c54b1bb670e23c1c5f1cccee116
[INFO] running `Command { std: "docker" "start" "-a" "8c6e4e67ce6b381e88b7ca2de6d6557d907b9c54b1bb670e23c1c5f1cccee116", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c6e4e67ce6b381e88b7ca2de6d6557d907b9c54b1bb670e23c1c5f1cccee116", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c6e4e67ce6b381e88b7ca2de6d6557d907b9c54b1bb670e23c1c5f1cccee116", kill_on_drop: false }`
[INFO] [stdout] 8c6e4e67ce6b381e88b7ca2de6d6557d907b9c54b1bb670e23c1c5f1cccee116
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dd902d1f6cbe40cfc5fc90f72c6ca72209def992d7aee1207b2290428cb4ee5c
[INFO] running `Command { std: "docker" "start" "-a" "dd902d1f6cbe40cfc5fc90f72c6ca72209def992d7aee1207b2290428cb4ee5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]     Checking unicode-ident v1.0.18
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.101
[INFO] [stderr]     Checking contracts v0.6.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> examples/library.rs:28:20
[INFO] [stdout]    |
[INFO] [stdout] 28 |     #[ensures(ret -> self.available.len() == old(self.available.len()) - 1)]
[INFO] [stdout]    |                    ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> examples/library.rs:29:20
[INFO] [stdout]    |
[INFO] [stdout] 29 |     #[ensures(ret -> self.lent.len() == old(self.lent.len()) + 1)]
[INFO] [stdout]    |                    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> examples/library.rs:30:26
[INFO] [stdout]    |
[INFO] [stdout] 30 |     #[debug_ensures(ret -> self.lent.contains(book_id))]
[INFO] [stdout]    |                          ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> examples/library.rs:31:27
[INFO] [stdout]    |
[INFO] [stdout] 31 |     #[debug_ensures(!ret -> self.lent.contains(book_id), "Book already lent")]
[INFO] [stdout]    |                           ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> tests/implication.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 |     #[ensures(do_thing -> ret.is_some(), "do_thing should cause a Some(_)")]
[INFO] [stdout]    |                         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> tests/implication.rs:13:26
[INFO] [stdout]    |
[INFO] [stdout] 13 |     #[ensures(!do_thing -> ret.is_none(), "!do_thing should cause a None")]
[INFO] [stdout]    |                          ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> tests/implication.rs:28:33
[INFO] [stdout]    |
[INFO] [stdout] 28 |     #[ensures(old(*x) % 2 == 0 -> *x % 2 == 0)]
[INFO] [stdout]    |                                 ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> tests/implication.rs:29:33
[INFO] [stdout]    |
[INFO] [stdout] 29 |     #[ensures(old(*x) % 2 == 1 -> *x % 2 == 1)]
[INFO] [stdout]    |                                 ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> tests/implication.rs:43:27
[INFO] [stdout]    |
[INFO] [stdout] 43 |     #[requires(!negative -> value >= 0)]
[INFO] [stdout]    |                           ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> tests/implication.rs:44:26
[INFO] [stdout]    |
[INFO] [stdout] 44 |     #[requires(negative -> value < 0)]
[INFO] [stdout]    |                          ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> tests/implication.rs:55:18
[INFO] [stdout]    |
[INFO] [stdout] 55 |     #[ensures(t -> ret)]
[INFO] [stdout]    |                  ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> tests/implication.rs:66:18
[INFO] [stdout]    |
[INFO] [stdout] 66 |     #[ensures(a -> b -> ret.is_some())]
[INFO] [stdout]    |                  ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.66s
[INFO] running `Command { std: "docker" "inspect" "dd902d1f6cbe40cfc5fc90f72c6ca72209def992d7aee1207b2290428cb4ee5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd902d1f6cbe40cfc5fc90f72c6ca72209def992d7aee1207b2290428cb4ee5c", kill_on_drop: false }`
[INFO] [stdout] dd902d1f6cbe40cfc5fc90f72c6ca72209def992d7aee1207b2290428cb4ee5c